iPhone的鎖屏監測分為兩種方式監聽：
1. 程序在前台，這種比較簡單。直接使用Darwin層的通知就可以了：
#import <notify.h>
#define NotificationLock CFSTR("com.apple.springboard.lockcomplete")
#define NotificationChange CFSTR("com.apple.springboard.lockstate")
#define NotificationPwdUI CFSTR("com.apple.springboard.hasBlankedScreen")
static void screenLockStateChanged(CFNotificationCenterRef center,void* observer,CFStringRef name,const void* object,CFDictionaryRef userInfo)
{
NSString* lockstate = (__bridge NSString*)name;
if ([lockstate isEqualToString:(__bridge NSString*)NotificationLock]) {
NSLog(@"locked.");
} else {
NSLog(@"lock state changed.");
}
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), NULL, screenLockStateChanged, NotificationLock, NULL, CFNotificationSuspensionBehaviorDeliverImmediately);
CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), NULL, screenLockStateChanged, NotificationChange, NULL, CFNotificationSuspensionBehaviorDeliverImmediately);
//setScreenStateCb();
return YES;
}
2. 第二種是程序退后台后，這時再鎖屏就收不到上面的那個通知了，需要另外一種方式, 以循環的方式一直來檢測是否是鎖屏狀態，會消耗性能並可能被蘋果掛起；
static void setScreenStateCb()
{
uint64_t locked;
__block int token = 0;
notify_register_dispatch("com.apple.springboard.lockstate",&token,dispatch_get_main_queue(),^(int t){
});
notify_get_state(token, &locked);
NSLog(@"%d",(int)locked);
}
- (void)applicationDidEnterBackground:(UIApplication *)application
{
while (YES) {
setScreenStateCb();
sleep(1);
}
}
關於 notify.h 請移步到：
https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man3/notify_register_check.3.html
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